"16 Ma according to duracell" - eh?
You can't ignore the sleep current.
The current could be 10 to 150 microAmps, depending on your code and PCB.
My calcs integtrate quiescent and transient and duration and how many per day.
This gives an aH figure.
All I will say is that this methd fairly accurately predicted battery lifes of half a dozen people-counting devices i did some years ago.
I'm only suggesting ballpark figures and not claiming anything rash. My estimate at 100 microAmps etc is 2 years for AA assuming 2aH because of unknown-to-me-operating-temperatures and rotting.
Aha!!
I guess the supply has dried up now you've retired?
A member of the local Constabulary:-
"Good evening Sir, I seem to have found some Procells in your cupboard. You realise you can't buy these in the shops?"
Rick: "Yes officer, I know that , but a kindly and mysterious stranger at the local Pub bought them for me from Farnell".
If that fails I'll come and visit you inside.
Wednesdays are good for me.
Oh Dear, Oh Dear, Oh Dear. Cheapo battery holders with cheapo switches in long-term-unattended and awkward to-get-to-possibly-damp places. You may regret being a skinflint Rick , but I hope not. Keep supporting the Chinese Empire mate
The problem I had with battery holders was in a commercial outdoor app.
Version 1 used the cheap 6xD holders from Maplin.
- One device got dropped and the sheer intertia of the mass of batteries broke the end of holder clean off - crap cheapo plastic.
- In another device , regular vibration momentarily moved the battery away from the pip (again inertia of battery sliding).
Moving over to QUALITY holders with spring contacts at BOTH ends got rid of the problem.
Result:
ChCh 0 Bulgin 2 (an away win).
You get what you pay for.
PS. Or simply design it better and use a single C 3.6V Lithium and solder some wires onto the axial leads. Will you worry about a tenner in 10years time? I don't think so.